blueseas wrote:
it is because X=W and Y=Z ...see my diagram (this information we got from statement 1 and 2)
therefore x+y = w+z
clear??
Yes, it is clear now. I don't know why I missed it earlier
But still let me clear it for somebody else who might in haste get trapped with this similar question (although it is pretty clear from your earlier post )
X=W --- (1)
Y=Z --- (2)
from (1) --> X+Y = W + Y
using (2)=> X + Y
...
